2016年6月25日，我国载人航天工程为发射货运飞船而全新研制的长征七号运载火箭，在海南文昌航天发射场点火升空。回答下列小题

如图，一段导线abcd位于磁感应强度大小为B的匀强磁场中，且与磁场方向(垂直于纸面向里)垂直．线段ab、bc和cd的长度均为L，且∠abc＝∠bcd＝135°.流经导线的电流为I，方向如图中箭头所示．导线段abcd所受到的磁场的作用力的合力(　　)

已知函数y=（m﹣1）x+m²﹣1是正比例函数，则m=____ 

写出与问句相对应的答句。

①Where are the boys?____           A. Yes, they are.

②Are they on the table?____          B. They're in the classroom.

③How much is your book?____        C. Yes. Here you are.

④Can I have some fish ?____          D. I'd like a glass of water.

⑤What would you like?____           E. Eight yuan.